Relay device.



PATENTED' MAY 29, 1906.

J. P. DOWNS. RELAY DEVICE. APPLICATION FILED 001.14, 1904'. I

K JP724 /714713 L/DH/V flow/v5 if; 192701775 I UNITED STATES PATENT Onion.

JOHN PHILIP DOWNS, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO NORTH ELECTRIC COMPANY, OF CLEVELAND, OHIO, A CORPORATION or OHIO.

Specification of Letters Patent.

Patented May 29, 1906.

Original application filed May 1, 1902, Serial No. 105,529. Divided and this application filed October 14,1904- Serial No. 228.479.

To all iuhom it may concern:

Be it known that I, JOHN PHILIP Downs, a'. citizen of the United States of America, and a resident of Boston, in the county of Suffolk,

State of Massachusetts, have invented certain new and useful Im rovements in Relay Devices, of which the fo lowing is a specification, a division of my application, Serial NO. 105,529,1iled May 1, 1902;

My invention relates to certain features of improvement previously set forth in my said application asapplied to relay devices, and has for its object the simplification and cheapening of the construction, particularly of electromagnetic devices, such as relays, wherein a surrounding shell or analogous part is' attached rearwardly to said electromagnetic device. I will, as in my prior application, set forth the said im rovements as applied to a highly-eificient telephone-relay, embodying other features of my invention. In appliances of this character it has been custornary to employ surrounding or protective shells, the mouths of which, being interiorly threaded, afford means for attaching to a coacting threaded part provided forwardly upon the relay device itself or upon its mounting-strip, as in United States Patent No. 650,915. In my improved construction, however, I have dispensed with this feature, simplifying and cheapening the same to the extent of employing a rearward tap ed part adapted to extend through the shel and en gage a thumb-nut or threaded part which I preferably, although not necessaril attach rot-atably to the shell, so that it wi l neither be displaced nor lost and will always be in position to secure or release the shell, as desired. This shell, as in prior constructions, serves to maintain the contained parts-seourely against injury and free from magnetic disturbances from external sources and from entrance of dust or foreign particles. These and other details of my invention will be made more apparent by reference to the accompanying drawings, wherein Figure I is a view in side elevation and partially in section. illustrating the relay device embodying my several im rovementsf II is an end view of the cylindrical shell.

The same character of reference is used to indicate similar parts ineach of the fi ures.

, I'shall endeavor herein to explain t e construction to the extent required for making Fig.

the details" of my improvements herein claimed clear and easily understood.

The core 0 of therelayis provided with the usual windings w. Superposedthereon by means of insulating-strlps contact-springs s are mounted in position to be actuated by therearwardly-disposed armature a, carrying a roller part which engagesthe extended end of one of said springs. The sprin s are secured in position upon the upward y-turned end of the return pole-piece p, which also supports the armature. l' I Entirely surrounding the above-described parts is -the well-known metallic shell or shieldfm, fitting closely upon a seat m vat-the forward or mounting-strip end of'the-relay. This shell is secured in position by' means of a brass screw b insertedwithin the end of the core, which carries as well the adjusting-nut n for the armature and the thumb nutl or tap ed. retaining part t, centrally positioned at't e end of' the shell. The thumbnut, as

indicated, isinteriorly flanged or upset with-.. a in the shell and provided with a washer-toretain said parts in position, while permitting it to be readily turned on and off the retain-' ing-screw b. The relay and its casin are thus made very readily separable an "are easily secured together throu h the medium of the screw, serving the dou 1e function'of securing the armature ad'ustment and of receiving the retaining part or the shell. Moreover, the thumb-nut is always in position to be assed over its retaining-screw when the she I isreplaced upon the relay andcannot be lost or displaced by carelessness; With the shell thus secured an electromagnetic device of this general character is found to be more convenient, simple, and cheapersin construction than devices of the prior art."

Having described a rela the details of which may be gathered, if esired,fro1n my original ap lication, and having set forth particularly t e features of improvement I de- I now make claimto the general character described, the combination with electromagnetic ap aratus, of a protective shell or casing there or, a forwardly-position-ed flanged-seat for one end thereof, a rearwardly-posrtion'ed screw, and a thumb-nut or tag ed retaining part permanently and rotata y secured to said shell and adapted to removably hold the same in position overthe parts of said appliance, substantially as set forth.

3. In an electromagnetic telephone appliw since, the combination with an electroma net, an armature controlled thereby, a threa ed'adjustin -screw andinut therefor, a pro tective shel or casing and a thumb -nut adaptedremovablyto. secure the shell in position over said parts, the saidthumb-nut engagingthe extremity ofthe threaded-adjustlr'ig-screw, substantially as set-forth.

4 In an electromagnetic ap liance of the general class described, the corn bination with an electromagnet, an armature controlled thereby, a threaded screw extending-rearwardly from .said 'elec-tromagnet, an adjustingnutthereon, a protective shell or casing, and a thumb' nut'rotatably mounted therein,

adapted reniovably to secure the shell in position over said parts, the thumb-nut and adjusting-nutbeing mounted upon said rearward-ly-extending screw, substantially as set forth.

5. In an electroma netic appliance of the general class described, the combination with electromagnetic apparatus, including an armature movable thereby, a combined adjusting and retaining screw extending rearwardly from the core of said electroinagnet, an ad justing-nut thereon for the armature, a cylindrical shell or casing surrounding the parts, anda threadedretaining part or thumb-nut thereon adapted 'removably to secure the shell in position, the threaded part and adjustin -nut being mountedupon the screw eXten g rearwardly' from the magnet, substantially as set forth.

Signed at Cleveland, this 27th day of September, A: D. 1904, in the presence of two subscribing Witnesses.

JOHN PHILIP" DGWNS:

Witnesses:

J OHN' MCDONNELL, ALBERT LYN'N' LAWRENCE. 

